Success! Using a grapplinghook and a winch on the drill itself I was able to counter the upward buoyancy. Extending the winch on the drill a meters so it can grab the ocean floor as it is lowered to the bottom keeps the drill in place. Mini sub center sections to provide the ballast for sinkage and the delivery of the drill head can vary , I have made several differant boats and blimps to bring the drill to a kethane patch in Kerbins ocean for tests . These would be good interplanetary deployment vehicles as well . Each vehical has the capacity to refine and hold a decent amount of kethane . That in combination with a kethane transport vessel is my system . Now that this is complete I will post pictures to help out others with this challenge . This was all Jeb's idea by the way .